
$(()->

  #设置人数的文本框每次改变内容时，动态计算出 ‘还需设置xxx人’的xxx值
  $("#micropost_content").bind('input', () ->
    personCount = $("#micropost_content").val()
    num = "("+(140 - personCount.length)+")"
    $("#label_forLeftChars").html(num))
)




